linux-kernel - Re: [PATCH 2/2] powerpc: Switch to generic WARN_ON()/BUG

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Message-ID: <20071011195544.GA4247@loki.buserror.net>
Date:	Thu, 11 Oct 2007 14:55:44 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Olof Johansson <olof@...om.net>
Cc:	linux-kernel@...r.kernel.org, grundler@...isc-linux.org,
	kyle@...isc-linux.org, linuxppc-dev@...abs.org,
	lethal@...ux-sh.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 2/2] powerpc: Switch to generic WARN_ON()/BUG_ON()

On Thu, Oct 11, 2007 at 12:14:13PM -0500, Olof Johansson wrote:
> Not using the ppc-specific WARN_ON/BUG_ON constructs actually saves about
> 4K text on a ppc64_defconfig. The main reason seems to be that prepping
> the arguments to the conditional trap instructions is more work than
> just doing a compare and branch.

It'd be nice if we could get GCC to generate bug table entries for
__builtin_trap(); that way we could use GCC's ability to put arbitrary
conditions in the trap instruction.

-Scott
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